As part of the T-Mobile merger with Sprint, the combined company was required to sell off Boost Mobile, one of Sprint’s prepaid MVNOs, to a third party. Dish Network, a Satellite TV company, ended up being that third party that purchased and acquired the Boost Mobile brand and its millions of subscribers. In a letter obtained by Axios, Dish complained to the FCC that T-Mobile is rushing to shut down Spring’s legacy CDMA (3G) network that millions of Boost Mobile customers are still using. Dish expected that T-Mobile would eventually shut down Sprint’s 3G network three to five years after...
Source: https://www.gsmarena.com/dish_calls_out_tmobile_for_wanting_to_shut_down_sprints_3g_network_too_soon-news-48484.php
